Koshamain

Koshamain (died 1457) was an Ainu leader from Hokkaido who led his people during a war with the Japanese in 1457. The war escalated as a dispute over a sword, and Koshamain and his followers sacked twelve forts before facing Takeda Nobuhiro and Kakizaki Sueshige's armies in battle. The samurai managed to win the battle, and Koshamain was slain and his rebellion crushed.